| Petronella Duncan | |
| Honorific-Suffix: | MP |
| Office: | Shadow Deputy Minister of Human Settlements |
| Successor: | Tandeka Gqada |
| Term End: | 2014 |
| Leader: | Helen Zille |
| Constituency Mp2: | Western Cape |
| Term Start2: | 6 May 2009 |
| Term End2: | 2014 |
| Nationality: | South African |
| Party: | Democratic Alliance |
Petronella Duncan is a South African politician, a former Member of Parliament with the Democratic Alliance,[1] and the former Shadow Deputy Minister of Human Settlements.